there are still many non-smart 1080p TV's out there.
netflix 4k, will first need a 4k tv and almost all have netflix 4k, a moot issue.
mibox s is probably the best choice for entry level looking for basic streaming incl aotg and netflix hd but not for heavy lifting.
alternatively, pay 4-5 times more for shield to get the same for these 2 apps.
aotg was once a tough nut but now many boxes can do, like u already showed.

not referring to any specific size...

there are plenty of existing 1080p Tv's in homes.

there are 1080p Tv's still sold in the shops, e.g.
https://my.sharp/products/full-hd-tvs
there are 4k smart Tv's with youtube but not Netflix.
https://my.sharp/products/4k-uhd-tvs

walk the stores, u find them.

such Tv's will need box that can do netflix HD and/or 4k if that is the objective.

smart = internet connected.

depending on brand and model, most have youtube, netflix and browser; cheaper ones may not have netflix.

androidtv or ATV is a special google android OS platform found only in smart 4k HDR TV's from Sony and Sharp; the rest use own OS.

ATV is good in that it allows u to sideload android apps beside the apps found in playstore, a good example being Astrogo.

if u already have a great android box, ATV may be less useful.

so, u buy the TV according to your needs.